The Lord threatens to kill every firstborn of Egypt. The Lord hardens the heart of Pharaoh, and Pharaoh continues to refuse to release the children of Israel.
BibleGateway: Exodus 11 ESV Text: Exodus 11 Exodus 11 (Listen) A Final Plague Threatened 11:1 The LORD said to Moses, “Yet one plague more I will bring upon Pharaoh and upon Egypt. Afterward he will let… The Lord threatens to kill every firstborn of Egypt. The Lord hardens the heart of Pharaoh, and Pharaoh continues to refuse to release the children of Israel.